We can't say that yet. Harry Kane is a good palter and even as a 31-year-old player he had good performance in Bayern Munich and any team he played for them. I think Harry Kane can even have the chance to play in older age while being in the good form just like what Ronaldo is doing while is old.
But still, Harry Kane can't be a long-term investment for Bayern Munich.
I think Bayern can find his use still for 3-4 more years in my opinion. He is a top striker and Bayern have invested a lot in order to get him. Naturally they will use him for a long term and they certainly have bought enough time with this also for finding a young striker filled in with good potential. I think in 2-3 years Bayern will start looking for next striker.
I agree, Harry doesn't seem to be lazy and new challenges motivate him. He just turned 30y 4 month ago, next 3 full season and age of Roberts end in 34y, looks not bad. Generally, there's Tel, who is, of course, a nominal forwarder but thrown to the winger role, where the position is also filled, so I wonder how he will solve it, but Tuchel? We have to wait for the end of the season.